The formation of usually fossilized amorphous hydrocarbons from ancient tree resins, having highly variable C:H:O ratios
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Category: <span>A</span>
A bright green or blue green variety of microcline sometimes cut as semi precious stones and for ornamental use
Alloys of mercury with one or more metal
A light, silvery-white, ductile metal with high electrical conductivity and high resistance to oxidation. Symbol, Al
Physical and chemical changes in a rocks or mineral subsequent to initial formation, and to a lesser degree than metamorphosis
Positively charged particles emitted from radioactive material
An orthorhombic mineral, Al2SiO5; its transparent green variety is used as a gem
Instrumentation used in measuring positively charged particles (Alpha rays) from radioactive sources
Light-colored igneous rock characterized by fine-grained saccharoidal texture, ranging in composition from gabbro to granite, consisting of quartz, potassium feldspar, and high acid plagioclase
The texture of igneous rock in which crystalline components are too small to be detected visually by the unaided eye. Syn. Cryptocrystalline